diff options
Diffstat (limited to 'drivers/acpi/acpi_video.c')
| -rw-r--r-- | drivers/acpi/acpi_video.c | 76 |
1 files changed, 61 insertions, 15 deletions
diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c index 3405f7a41e25..06a006ff89b0 100644 --- a/drivers/acpi/acpi_video.c +++ b/drivers/acpi/acpi_video.c @@ -77,14 +77,21 @@ module_param(allow_duplicates, bool, 0644); static int disable_backlight_sysfs_if = -1; module_param(disable_backlight_sysfs_if, int, 0444); +#define REPORT_OUTPUT_KEY_EVENTS 0x01 +#define REPORT_BRIGHTNESS_KEY_EVENTS 0x02 +static int report_key_events = -1; +module_param(report_key_events, int, 0644); +MODULE_PARM_DESC(report_key_events, + "0: none, 1: output changes, 2: brightness changes, 3: all"); + static bool device_id_scheme = false; module_param(device_id_scheme, bool, 0444); static bool only_lcd = false; module_param(only_lcd, bool, 0444); -static int register_count; -static DEFINE_MUTEX(register_count_mutex); +static DECLARE_COMPLETION(register_done); +static DEFINE_MUTEX(register_done_mutex); static struct mutex video_list_lock; static struct list_head video_bus_head; static int acpi_video_bus_add(struct acpi_device *device); @@ -412,6 +419,13 @@ static int video_enable_only_lcd(const struct dmi_system_id *d) return 0; } +static int video_set_report_key_events(const struct dmi_system_id *id) +{ + if (report_key_events == -1) + report_key_events = (uintptr_t)id->driver_data; + return 0; +} + static struct dmi_system_id video_dmi_table[] = { /* * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121 @@ -500,6 +514,24 @@ static struct dmi_system_id video_dmi_table[] = { DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), }, }, + /* + * Some machines report wrong key events on the acpi-bus, suppress + * key event reporting on these. Note this is only intended to work + * around events which are plain wrong. In some cases we get double + * events, in this case acpi-video is considered the canonical source + * and the events from the other source should be filtered. E.g. + * by calling acpi_video_handles_brightness_key_presses() from the + * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb + */ + { + .callback = video_set_report_key_events, + .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS), + .ident = "Dell Vostro V131", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), + }, + }, {} }; @@ -1480,7 +1512,7 @@ static void acpi_video_bus_notify(struct acpi_device *device, u32 event) /* Something vetoed the keypress. */ keycode = 0; - if (keycode) { + if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { input_report_key(input, keycode, 1); input_sync(input); input_report_key(input, keycode, 0); @@ -1544,7 +1576,7 @@ static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) acpi_notifier_call_chain(device, event, 0); - if (keycode) { + if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { input_report_key(input, keycode, 1); input_sync(input); input_report_key(input, keycode, 0); @@ -2017,8 +2049,8 @@ int acpi_video_register(void) { int ret = 0; - mutex_lock(®ister_count_mutex); - if (register_count) { + mutex_lock(®ister_done_mutex); + if (completion_done(®ister_done)) { /* * if the function of acpi_video_register is already called, * don't register the acpi_vide_bus again and return no error. @@ -2039,22 +2071,22 @@ int acpi_video_register(void) * When the acpi_video_bus is loaded successfully, increase * the counter reference. */ - register_count = 1; + complete(®ister_done); leave: - mutex_unlock(®ister_count_mutex); + mutex_unlock(®ister_done_mutex); return ret; } EXPORT_SYMBOL(acpi_video_register); void acpi_video_unregister(void) { - mutex_lock(®ister_count_mutex); - if (register_count) { + mutex_lock(®ister_done_mutex); + if (completion_done(®ister_done)) { acpi_bus_unregister_driver(&acpi_video_bus); - register_count = 0; + reinit_completion(®ister_done); } - mutex_unlock(®ister_count_mutex); + mutex_unlock(®ister_done_mutex); } EXPORT_SYMBOL(acpi_video_unregister); @@ -2062,15 +2094,29 @@ void acpi_video_unregister_backlight(void) { struct acpi_video_bus *video; - mutex_lock(®ister_count_mutex); - if (register_count) { + mutex_lock(®ister_done_mutex); + if (completion_done(®ister_done)) { mutex_lock(&video_list_lock); list_for_each_entry(video, &video_bus_head, entry) acpi_video_bus_unregister_backlight(video); mutex_unlock(&video_list_lock); } - mutex_unlock(®ister_count_mutex); + mutex_unlock(®ister_done_mutex); +} + +bool acpi_video_handles_brightness_key_presses(void) +{ + bool have_video_busses; + + wait_for_completion(®ister_done); + mutex_lock(&video_list_lock); + have_video_busses = !list_empty(&video_bus_head); + mutex_unlock(&video_list_lock); + + return have_video_busses && + (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); } +EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); /* * This is kind of nasty. Hardware using Intel chipsets may require |